Update fontstash.h

* change call order in `fonsDeleteInternal` so that free memory isn't passed to `fons__tt_done`

src/fontstash.h

@@ -1660,8 +1660,8 @@ void fonsDeleteInternal(FONScontext* stash)
 	if (stash->fonts) free(stash->fonts);
 	if (stash->texData) free(stash->texData);
 	if (stash->scratch) free(stash->scratch);
-	free(stash);
 	fons__tt_done(stash);
+	free(stash);
 }
 
 void fonsSetErrorCallback(FONScontext* stash, void (*callback)(void* uptr, int error, int val), void* uptr)